Analyses of plant responses to boron deprivation

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Boron is an essential micronutrient for plants. Boron deficiency is one of the major constraints in crop production worldwide. However, it remains unclear how boron deficiency causes various metabolic disorders and cell death. To understand the mechanism, we analyzed the physiological changes in Arabidopsis plants induced upon boron deprivation. The cells in root elongation zone overaccumulated reactive oxygen species and died within 1 h after boron deprivation. Similar responses could be observed under calcium deprivation. Analyses suggested that the immediate responses were triggered by a failure in cross-linking the cell wall pectic polysaccharides which were newly synthesized in elongating cells.